遊離端義歯の最後臼歯に加わる力が各維持歯におよぼす影響に関する基礎的研究

概要

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When the clasp is designed, the stability of denture in the mouth and the influence on the residual tissue have to be well considered. The load reducing clasp was first made by Evans in 1865, ever since it has been improved by Roach, Chayes and others. In the present time, many types of clasp are used fitting to the individual clinical symptom. Though there are a good many papers about the effect of clasp on the abutment tooth, almost all of them have been written about the mobility of the abutment tooth. So, the author measured the distal, the lingual or the basal stress of alveolar cavity caused by the force added to the missing portion (<7|>^^^-) of the free-end saddle denture on abutment teeth (<4|47>^^^-). The experiments were performed on the three types of clasp (Akers clasp, Roach T-bar casp and I-bar clasp), by using a commercial mandibular model. The results obtained were as follows : (1) The stress-breaking effect of Akers, Roach T-bar and I-bar clasp on the abutment tooth was different from each other. In the normal load, I-bar clasp showed the highest stress breaking effect. On the contrary, in the load of the distal direction, Roach's T-bar clasp exhibited the greatest effect as a stress breaker. (2) When the normal load was added to the right second molar portion, the distal stress was higher than the cavity base stress in case of (<4|>^^^-). (3) When the first right premolar was compressed directly, the cavity base stress was remarkably high in comparison with the distal stress.
九州歯科学会の論文
1974-03-31

著者

守川雅男
九州歯科大学歯科補綴学第1講座

遊離端義歯の最後臼歯に加わる力が各維持歯におよぼす影響に関する基礎的研究

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